Let's get this math done. We have 790 and we're going to multiply it by 26. This is the same as taking 790 and adding it to itself 26 times.
Step 1: 0 + 790 = 790
Step 2: 790 + 790 = 1580
Step 3: 1580 + 790 = 2370
Step 4: 2370 + 790 = 3160
Step 5: 3160 + 790 = 3950
Step 6: 3950 + 790 = 4740
Step 7: 4740 + 790 = 5530
Step 8: 5530 + 790 = 6320
Step 9: 6320 + 790 = 7110
Step 10: 7110 + 790 = 7900
Step 11: 7900 + 790 = 8690
Step 12: 8690 + 790 = 9480
Step 13: 9480 + 790 = 10270
Step 14: 10270 + 790 = 11060
Step 15: 11060 + 790 = 11850
Step 16: 11850 + 790 = 12640
Step 17: 12640 + 790 = 13430
Step 18: 13430 + 790 = 14220
Step 19: 14220 + 790 = 15010
Step 20: 15010 + 790 = 15800
Step 21: 15800 + 790 = 16590
Step 22: 16590 + 790 = 17380
Step 23: 17380 + 790 = 18170
Step 24: 18170 + 790 = 18960
Step 25: 18960 + 790 = 19750
Step 26: 19750 + 790 = 20540

So, 790*26 = 20540